Dash-pot mechanism.



1. GIOULDBOURN.

DASH POT MECHANlSM.

APPLICATION FILED DEC-5. 191 3.

1 ,240, 1 96. Patented Sept. 18, 1917 EETSS'HEET I,

M7 2. WW l Zf J. GOULDBOURN.

.DASH POT MECHANISM. APPLICATION -F|LED Dams. m3.

Patented Sept. '18,-

EETS-SHEET l/M/TA/ESSQS W7.

J. GOULDBOURN.

DASH POT MECHANISM. APPLICATION mavens. 1913.

Patented Sept. 18; 1917.

3 shins-swans.

l l//77VESSES" movement of a JosEP GOULDBOURN, 0E LEICESTER, MACHINERY COMPANY, or rA'rEE N W JERSEY.

To all whom, it may concern: 7 7

Be it known that I, JOSEPH GoULDBoUnN, a subject. of the King of England, residing at Leicester, Leicestershire, England, have invented certain Improvements in Dash-Pot Mechanisms, of which the following description in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to improved dashpot mechanism for use in machinery for retarding the movement of apart of the machine, as for example, a power operated lever to which motion is. transmitted'through a spring and from which the load is released while the spring is under a tension which would tendito cause the'lever to move past itsnormal'stopping position and do damage. Another and more important use to which: the novel dashpot of this invention has been put is to retard the power-effected lever or the like operated as suggested, whereby power is stored in the transmission spring and is gradually given out through the lever as the dashpot permits. A feature of the invention resides in a novel construction and arrangement of relatively movable members, one having a chamber for the reception of a fluid and the other being shaped to serve as a piston in said chamber, together with means providing a restricted passage in communication with the chamber to permit a retarded flow of the fluid upon a relative movementof said member. In the construction shown an outer member is provided, having achamber ofrelativelysmall diameter in its lower ortion, and an inner member held substane tially stationary 7 piston in the'smaller portion of the chamber and is provided with a passage for conducting thefiuid from the lower to-the upper portionof the chamber when the outer memberis. raised.

Further features of the invention. reside in novel means for controlling the flow of the retarding fluid,-and in'a novel construction and arrangement affordingan initial unretarded relative movement of the portions of the dashpot mechanism.

These and other features of the invention DASH-TOT MECHANISM.

Specification of Letters Patent.

is arranged to serve as a ENGLAND, AS-SIGNOR TO UNITED SHOE Patented Sept. 18, 1917.

. Application filed December 6, 1913. Serial 110,805,159.

will now be more particularly described in connection with the accompanying drawings and will then be pointed out in the claims.

Flgure l is aside elevation of part of a machine in which a lever is operated as above described with a preferred construction of the new dashpot mechanism applied thereto;

Fig. 2 is a sectional side elevation of'a portion of the machine drawn to a larger scale than Fig. 1, the updrawing lever being shown in its raised position;

Fig. 3 is a view similar to Fig. 2, the updrawing lever being shown in its lowered position, and

Fig. 4: is a section on the line 8 3 of Fig. 2 looking in the direction of the arrow.

The embodiment of the invention herein shown'comprises an outer member or plunger 1 which is mounted to slide. within a bore 2 formed 'n a boss on the framework 3 ofthe machine. The plunger ishollow to hold oil or other fluid and thelower portion 4 of the chamberin the plunger is of smaller diameter than the upper portion 5. Secured to the frame 3 and extending within the bore 2 is a cylindrical inner member 6 which'is shaped to serve as a piston in the lower portion of the chamber in the plunger. The upper. end of this member is provided with a reduced barrel-shaped portion 8 which is received loosely within a recess 10 formed in the frame, the member 6 being held in place by a screw 12'which passes through the boss and enters loosely a hole in. the barrel-.

shaped portion ofthe member 6. This method of attaching the vmember 6 to the frame allows the member to'rock slightly for a purpose which will be hereinafter explained.

Surrounding the member 6 is a coiied spring 15 which bears at its upper end against a flange lt projecting from the member 6 and at its lower end bears against a shoulder 16 at the junction of the upper and ger 1; The member 6 is also provided with a valve spindle25 which is screwed therein at 1ts upper end, as shown in F 1g. 2, and 1s provided with a reduced portion 24 which is positioned in the enlarged portion 21 of the passage 20. The reduced portion 24 of the valve spindle is of slightly less diameter than the enlarged portion 21 of the passage, so as to allow fluid to pass between the walls of the passage 7 and the spindle and out through the ports 23, as will be hereinafter explained.

A'passage 26 is formed in the frame which when the plunger 1 is in an extreme outer position, lower than shown in Fig. 3, communicates through the bore 2 with the portion'5 of the chamber in the plunger. This passage is provided for the purpose of allowing oil or any other suitable liquid to be poured into the chamber.

The-dashpot device is preferably arranged at an angle to the horizontal, as shown, so that the oil will flow into the lower portion 41 0f the chamber in the plunger when the member 6is removed from that portion of the plunger.

Before the beginning of the updrawing movement of the lever 18, which is fulcrumed at 19 and operated .by power driven mechanism through spring 21, the plunger ,1, which as previously mentioned is held in engagement with the lever by means of the spring 15, is situated as shown 1n Fig. 3 with respect to the member 6, that is, with the lower end of the member 6 positioned in the enlarged or upper portion 5 of the chamber in the plunger 1 and some distance above the lower or smaller portion 40f the chamber. 'VVhe n the updrawing movement of the lever commences the plunger 1 will be forced inward in the bore 2 and moved toward the member 6 and continued inward movement of'the plunger will cause the member 6 to extend into the lower portion 4 of the chamber and cause the oil contained in thechame berto be forced through the passage 20 past the valve spindle 25 and out through the ports 23. The oil will thusbe forced gradually into the portion 5 of the chamber, and

when the updrawing lever moves in a reverse direction and the lower portion 4 of the chamber in the plunger is moved by gravity and the spring 15 away from the cylindrical member the latter is completely withdrawn from the portion 4 of the chamber as shown in Fig; 3, and the oil will then quickly flow back into the lower portion of the chamber and be ready for the neXt lever retarding operation of the dashpot. The dashpot is: preferably, although not necessarily, so constructed that the member 6 is that the updrawing movement of the lever is checked or retarded by reason of the necessarily slow passage of the oil out of chamber; also it will be understood that if the lever is thereafter freed from its load the device will act as abufferand preventshock to the parts of the machine. In order to vary the resistance afforded to theupdrawing motion, the valve spindle can be adjusted longitudinally and be locked in its position of adjustment by milled nuts 30. This adjustment varies the position of the'valve spindle in the enlarged portion of the passage in'the cylindrical member and increases or decreases the resistance oifered'to the passage of the'oil, and consequently the rate of portion 4 of the chamber in the plunger 1 and thus insure that the membershall enter said lower portion. The lower' end of the member 6 is rounded off so that should it engage the shoulder 16it will slide off and be directed into said lower portion. The flange 14 on the member 6 is arranged to bear against'the end surface 32 of the bore 2 and this flange serves to take up the end thrust of the member. I

In order to'direct oil, after it has passed through the ports 23, into the chamber in the plunger 1 there is provided at the top of the plunger a downwardly and inwardly projectingfiange 34. This flange also serves to prevent oil from being thrown out of 1 the plunger into the upper part of the bore 2 and so assist's in-preventing wasteof oil by leakage. If desired, a non-return valve may be provided in the passage 26 so as to minimize any leakage through this passage. Having now describedtheinvention and explained in what manner thesame may be used, I claim as new and'desire to secure by Letters Patent ofthe United States 11A dashpot mechanism comprising aj plunger having a chamber open 'at its upper end andadapted to'contain liquid, a

member extending through said open end and fitting into said chamberand having a discharge passage, and a frame or support in which said member is fastened and which has a bore in which the plunger is movable,

said parts being so-constructed and arranged,

smaller portion of said that during the rise of the plunger the liquid will be forced through the passage in said member. I

2. A dashpot mechanism comprising a plunger having a fluid containing chamber of relatively large diameter in the upper portion'of the plunger and of smaller diameter in the lower portion of the plunger, a substantially stationary member extending freely through the large part of said chamber and adapted to fit the smaller part of the chamber and having a passage from its lower end upwardly, and a port located-to cause said passage to: communicate with the larger part of the chamber in the plunger as the plunger is raised. 1

3. A dashpot mechanism comprising a plunger havinga fluid containing chamber of relatively large diameter in the upper portion of the plunger and of smaller diameter in-the lower portion of the plunger, a substantially stationary 'member extending freely through the larger part of saidchamher and adapted to fit the smaller part of the chamber and having a passage from its lower end upwardly, a port located to cause said passage to communicate with the larger part of the chamber in the plunger '7 as the plunger is raised, and a valve spindle fitting the upper portion of said passage andhaving a reduced portion adapted to be adjusted to extend more or less past the port.

4:. A dashpot mechanism comprising a frame or support having a bore, a hollow plunger guided in said bore, the lower portion of the chamber in the plunger being of smaller diameter than the upper portion, and a member held longitudinally stationary but laterally rockable in the frame or support to permit it to find and freely enter the smaller portion of the chamber in the plunger, said member being shaped to fit in the chamber and pro vided with a passage extending from its lower end and communicating with the larger portion of the chamber in all relative operative positions of the plunger and member.

5. A dashpot mechanism comprising a frame or support having a bore, a hollow plunger guided in said bore, the lower portion of the chamber in the plunger being of smaller diameter than the upper portion, and amember held longitudinally stationary in the frame or support, a spring arranged to move theplunger in one direction in said bore, said member having an internal passage forming a restricted communication between the lower portion of the plunger chamber and the upper portion thereof to cause fluid in the chamber to retard and delay the movement of the plunger into saidbore.

-6. A dashpot mechanism comprising a plunger having a fluid containing chamber of relatively large diameter in the upper portion of the plunger and of smaller diameter in the lower portion of the plunger, a substantially stationary member extending freely through the larger part of said chamber and adapted to fit the smaller part of the chamber and having a passage from its lower end upwardly, a port located to effect communication between said passage and the larger part of the chamber in the plunger as the plunger is raised, and a passage formed in the frame'or support and located so as to be closed by the plunger in' all work'- ing positions of the latter and to communicate with the bore in the frame and-therethrough with the chamber in the plunger to supply liquid to the plunger chamber when the plunger is lowered to an abnormal position.

7 A dashpot mechanism comprising an outer member 1 having a fluid containing chamber 4 and a chamber 5 of larger diameter opening thereinto, an inner member 6 having a part fitted to the chamber 4: to expel the fluid therefrom and a restricted passage through which the fluid must escape from chamber 4 into chamber 5 whereby relative approach of the two members is retarded, and a spring 15 arranged to withdraw from the chamber4 into the chamber 5 the part of the inner member which fits the chamber 4 whereby quick refilling of chamber 1 is permitted. 5

8. A dashpot mechanism comprising an outer member having a fluid containing chamber, an inner member shaped to serve as a piston in said chamber, one of said members having a restricted passage to permit a retarded flow of the fluid from the chamber upon a relative closing movement of the members, and means for positioning said members normally with theinner member at a distance from said chamber to per mit a limited unretarded relative movement of the members prior to the entrance of the inner member into the chamber.

9. A dashpot mechanism comprising an outer member having a fluid containing chamber of relatively small diameter in its lower portion and of larger diameter in its upper portion, an inner member shaped to serve as a piston in the lower portion of said chamber and upper portion of the chamber, one of said members having a restricted passage to permit a retarded flow of the fluid from said lower portion of the chamber to the upper portion upon a relative closing movement of said members, and means for effecting a relative return movement of said members of sufficient extent to open the lower portion of the chamber to the upper portion for the return of the fluid.

10. A dashpot mechanism comprising an outer member having a fluid containing to extend freely through the -Copies of' this patent may be obtained'for five cents each, by addressing the Commissioner Washington, D. 0. I 7

chamber of relatively small diameter in its lower portion and of larger diameter in its upperlportion, an inner member shaped to serve as .a piston in the lower portion of said chamber and to extend freely through the upper portion of the chamber, means for guiding the outer member for movement toward and from the inner memher, one of said members having a restricted passage to permit a retarded flow of the fluid fromthe lower portion of the chamber to the upper portion upon a moves ment of the outer member toward the inner member, and means for effecting a return movementof the outer .member of suflicient extent to open the lower portion of the chamber to the upper portion and position said lower portion of the chamber at a distance from the lower end of the inner memlO6I'.: v I

11. A' dashpot mechanism comprising an outer member havinga fluid containing chamber, an inner member shapedto serve as axpiston in-said chamber, said inner memher having a passage extending"lengthwise thereof and arranged to open into said chamber and a port leading laterally from said passage outside ofthat portion of the having a passage extending lengthwise thereof and arranged to open into said chamber and a port leading laterally from the outer portion of said passage, said outer portion of the passage being enlarged in diameter, and a valve spindle adjustable lengthwise in said enlarged portion of the passage and having an end portion of reduced diameter arranged to extend past said port and movable toward or from the smaller portion of the passage in the adjustment of the valve.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH GOULDBOURN.

lVitnesses:

FREDERICK WILLIAM WoRTI-I, ERNEST Horn.

of Patents, 

